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Characteristic of chordates, the notochord is a stiff rod of tissue along the back of the body. In vertebrates, the backbone is deposited around the notochord and nerve cord.
Industry:Biology
A specialized cell that can react to stimuli and transmit impulses. A neuron consists of a body which contains the nucleus; dendrites, which are short branches off the body that receive incoming impulses; and a long axon which carries impulses away from the body and to the next neuron.
Industry:Biology
Primary bundle of nerves in chordates, which connects the brain to the major muscles and organs of the body.
Industry:Biology
Segment of the body formed by a region of muscle. The myotomes are an important feature for recognizing early chordates.
Industry:Biology
Sticky secretion used variously for locomotion, lubication, or protection from foreign particles.
Industry:Biology
Bundle of contractile cells which allow animals to move. Muscles must act against a skeleton to effect movement.
Industry:Biology
Front opening of the digestive tract, into which food is taken for digestion. In flatworms, the mouth is the only opening into the digestive cavity, and is located on the "belly" of the worm.
Industry:Biology
A mammal that lays eggs rather than giving live birth. Though laying eggs is a primitive reptilian trait, monotremes share many morphological, physiological, and reproductive characteristics with other mammals, making them true mammals. Extant monotremes include the duck-billed platypus and echidna.
Industry:Biology
